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Standardized measures seem to point out that the average level of anxiety has raised gradually over the past 50 years (Twenge, 2000). In the 1950's the average score on the Child Manifest Anxiety Scale was µ = 15.1. A sample of n = 16 of today's children produces mean score of M = 23.3 with SS = 240.

a. Based upon the sample, make a point estimate of population mean anxiety score for today's children.

b. Make an 80% confidence interval estimate of today's population mean.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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